I am looking to figure out what is wrong w/my truck without spending money I dont have on parts that are good and dont need replacing.

The truck is a 2006 F250 XLT Lariat SC w/5.4 3v, FX4

So Im looking for a donor and known to be good set of all 4 of the o2 sensors. They will be returned to the donor after I have diagnosed the problem parts and replaced them w/new ones. Basically im just looking for loaners to help diagnose the problem without purchasing each part from ford until I find the culprit, I'll p/u shipping both ways (obviously). Any other suggestions of the culprit and a loaner part to help figure the fix would be greatly appreciated.

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